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You can try resetting the rollout switch(es) (see attached pic for typical). They are located just outside the burner chamber. Turn off the power then press the small button between the 2 leads to reset it. If it clicks you have reset it and the unit will fire up when you turn the power back on with any luck. If it doesn't click it wasn't tripped.Check to be sure there isn't more than one by tracing the leads connected to the switch.
Next trace out the leads connected to the rollouts to the limit (see attached for typical). It should be above the burners on the face of the unit. Once you find it connect the 2 leads together and turn the power back on. What happens?
Whatever you have to do to be sure you have and keep a good contact.
Then the next step is to trace those leads back to the board and test for continuity across the leads at the board. If you have continuity then the board is suspect. If you have an open circuit then you have to trace out the entire circuit and check for bad connections or open devices in the circuit.
That's an open limit circuit error which is what we've been tracking down. If you can't do a continuity test then you've done all you can and you'll have to call in a pro.
I can't go any further with you without the continuity testing
Sounds like you found a way to test the continuity of the limit circuit. Glad you worked it out.